HOUSTON -- Customers at a Shell station in southwest Houston got a surprise Thursday afternoon.

Three-time Indy 500 champion Helio Castroneves was there to hand out prizes to customers stopping for a fill-up.

It was a promotion for Shell's Formula for Excitement contest, where fans can win an ultimate driving weekend from Shell -- drive a racecar and attend the Indy 500.

Castroneves will be competing in one of the 12 Grand Prix races this weekend at Reliant Park.

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